<?php


    /**
     * File: Browser.php
     * Author: Chris Schuld (http://chrisschuld.com/)
     * Last Modified: August 20th, 2010
     * Last Modified: No 2013  , by dsphinx
     *
     * @version 1.9
     * @package PegasusPHP
     *
     * Copyright (C) 2008-2010 Chris Schuld  (chris@chrisschuld.com)
     *
     * This program is free software; you can redistribute it and/or
     * modify it under the terms of the GNU General Public License as
     * published by the Free Software Foundation; either version 2 of
     * the License, or (at your option) any later version.
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU General Public License for more details at:
     * http://www.gnu.org/copyleft/gpl.html
     *
     *
     * Typical Usage:
     *
     *   $browser = new Browser();
     *   if( $browser->getBrowser() == Browser::BROWSER_FIREFOX && $browser->getVersion() >= 2 ) {
     *    echo 'You have FireFox version 2 or greater';
     *   }
     *
     * User Agents Sampled from: http://www.useragentstring.com/
     *
     * This implementation is based on the original work from Gary White
     * http://apptools.com/phptools/browser/
     *
     */

    class Browser extends  Input
    {
        private $_agent = '';
        private $_browser_name = '';
        private $_version = '';
        private $_platform = '';
        private $_os = '';
        private $_is_aol = FALSE;
        private $_is_mobile = FALSE;
        private $_is_tablet = FALSE;
        private $_is_robot = FALSE;
        private $_is_facebook = FALSE;
        private $_aol_version = '';

        const BROWSER_UNKNOWN = 'unknown';
        const VERSION_UNKNOWN = 'unknown';

        const BROWSER_OPERA = 'Opera'; // http://www.opera.com/
        const BROWSER_OPERA_MINI = 'Opera Mini'; // http://www.opera.com/mini/
        const BROWSER_WEBTV = 'WebTV'; // http://www.webtv.net/pc/
        const BROWSER_IE = 'Internet Explorer'; // http://www.microsoft.com/ie/
        const BROWSER_POCKET_IE = 'Pocket Internet Explorer'; // http://en.wikipedia.org/wiki/Internet_Explorer_Mobile
        const BROWSER_KONQUEROR = 'Konqueror'; // http://www.konqueror.org/
        const BROWSER_ICAB = 'iCab'; // http://www.icab.de/
        const BROWSER_OMNIWEB = 'OmniWeb'; // http://www.omnigroup.com/applications/omniweb/
        const BROWSER_FIREBIRD = 'Firebird'; // http://www.ibphoenix.com/
        const BROWSER_FIREFOX = 'Firefox'; // http://www.mozilla.com/en-US/firefox/firefox.html
        const BROWSER_ICEWEASEL = 'Iceweasel'; // http://www.geticeweasel.org/
        const BROWSER_SHIRETOKO = 'Shiretoko'; // http://wiki.mozilla.org/Projects/shiretoko
        const BROWSER_MOZILLA = 'Mozilla'; // http://www.mozilla.com/en-US/
        const BROWSER_AMAYA = 'Amaya'; // http://www.w3.org/Amaya/
        const BROWSER_LYNX = 'Lynx'; // http://en.wikipedia.org/wiki/Lynx
        const BROWSER_SAFARI = 'Safari'; // http://apple.com
        const BROWSER_IPHONE = 'iPhone'; // http://apple.com
        const BROWSER_IPOD = 'iPod'; // http://apple.com
        const BROWSER_IPAD = 'iPad'; // http://apple.com
        const BROWSER_CHROME = 'Chrome'; // http://www.google.com/chrome
        const BROWSER_ANDROID = 'Android'; // http://www.android.com/
        const BROWSER_GOOGLEBOT = 'GoogleBot'; // http://en.wikipedia.org/wiki/Googlebot
        const BROWSER_SLURP = 'Yahoo! Slurp'; // http://en.wikipedia.org/wiki/Yahoo!_Slurp
        const BROWSER_W3CVALIDATOR = 'W3C Validator'; // http://validator.w3.org/
        const BROWSER_BLACKBERRY = 'BlackBerry'; // http://www.blackberry.com/
        const BROWSER_ICECAT = 'IceCat'; // http://en.wikipedia.org/wiki/GNU_IceCat
        const BROWSER_NOKIA_S60 = 'Nokia S60 OSS Browser'; // http://en.wikipedia.org/wiki/Web_Browser_for_S60
        const BROWSER_NOKIA = 'Nokia Browser'; // * all other WAP-based browsers on the Nokia Platform
        const BROWSER_MSN = 'MSN Browser'; // http://explorer.msn.com/
        const BROWSER_MSNBOT = 'MSN Bot'; // http://search.msn.com/msnbot.htm
        // http://en.wikipedia.org/wiki/Msnbot  (used for Bing as well)

        const BROWSER_NETSCAPE_NAVIGATOR = 'Netscape Navigator'; // http://browser.netscape.com/ (DEPRECATED)
        const BROWSER_GALEON = 'Galeon'; // http://galeon.sourceforge.net/ (DEPRECATED)
        const BROWSER_NETPOSITIVE = 'NetPositive'; // http://en.wikipedia.org/wiki/NetPositive (DEPRECATED)
        const BROWSER_PHOENIX = 'Phoenix'; // http://en.wikipedia.org/wiki/History_of_Mozilla_Firefox (DEPRECATED)

        const PLATFORM_UNKNOWN     = 'unknown';
        const PLATFORM_WINDOWS     = 'Windows';
        const PLATFORM_WINDOWS_CE  = 'Windows CE';
        const PLATFORM_APPLE       = 'Apple';
        const PLATFORM_LINUX       = 'Linux';
        const PLATFORM_OS2         = 'OS/2';
        const PLATFORM_BEOS        = 'BeOS';
        const PLATFORM_IPHONE      = 'iPhone';
        const PLATFORM_IPOD        = 'iPod';
        const PLATFORM_IPAD        = 'iPad';
        const PLATFORM_BLACKBERRY  = 'BlackBerry';
        const PLATFORM_NOKIA       = 'Nokia';
        const PLATFORM_FREEBSD     = 'FreeBSD';
        const PLATFORM_OPENBSD     = 'OpenBSD';
        const PLATFORM_NETBSD      = 'NetBSD';
        const PLATFORM_SUNOS       = 'SunOS';
        const PLATFORM_OPENSOLARIS = 'OpenSolaris';
        const PLATFORM_ANDROID     = 'Android';

        const OPERATING_SYSTEM_UNKNOWN = 'unknown';

        public function Browser($userAgent = "")
        {
            $this->reset();
            if ($userAgent != "") {
                $this->setUserAgent($userAgent);
            } else {
                $this->determine();
            }
        }

        /**
         * Reset all properties
         */
        public function reset()
        {
            $this->_agent        = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : "";
            $this->_browser_name = self::BROWSER_UNKNOWN;
            $this->_version      = self::VERSION_UNKNOWN;
            $this->_platform     = self::PLATFORM_UNKNOWN;
            $this->_os           = self::OPERATING_SYSTEM_UNKNOWN;
            $this->_is_aol       = FALSE;
            $this->_is_mobile    = FALSE;
            $this->_is_tablet    = FALSE;
            $this->_is_robot     = FALSE;
            $this->_is_facebook  = FALSE;
            $this->_aol_version  = self::VERSION_UNKNOWN;
        }

        /**
         * Check to see if the specific browser is valid
         *
         * @param string $browserName
         *
         * @return bool True if the browser is the specified browser
         */
        function isBrowser($browserName)
        {
            return (0 == strcasecmp($this->_browser_name, trim($browserName)));
        }

        /**
         * The name of the browser.  All return types are from the class contants
         *
         * @return string Name of the browser
         */
        public function getBrowser()
        {
            return $this->_browser_name;
        }

        /**
         * Set the name of the browser
         *
         * @param $browser string The name of the Browser
         */
        public function setBrowser($browser)
        {
            $this->_browser_name = $browser;
        }

        /**
         * The name of the platform.  All return types are from the class contants
         *
         * @return string Name of the browser
         */
        public function getPlatform()
        {
            return $this->_platform;
        }

        /**
         * Set the name of the platform
         *
         * @param string $platform The name of the Platform
         */
        public function setPlatform($platform)
        {
            $this->_platform = $platform;
        }

        /**
         * The version of the browser.
         *
         * @return string Version of the browser (will only contain alpha-numeric characters and a period)
         */
        public function getVersion()
        {
            return $this->_version;
        }

        /**
         * Set the version of the browser
         *
         * @param string $version The version of the Browser
         */
        public function setVersion($version)
        {
            $this->_version = preg_replace('/[^0-9,.,a-z,A-Z-]/', '', $version);
        }

        /**
         * The version of AOL.
         *
         * @return string Version of AOL (will only contain alpha-numeric characters and a period)
         */
        public function getAolVersion()
        {
            return $this->_aol_version;
        }

        /**
         * Set the version of AOL
         *
         * @param string $version The version of AOL
         */
        public function setAolVersion($version)
        {
            $this->_aol_version = preg_replace('/[^0-9,.,a-z,A-Z]/', '', $version);
        }

        /**
         * Is the browser from AOL?
         *
         * @return boolean True if the browser is from AOL otherwise false
         */
        public function isAol()
        {
            return $this->_is_aol;
        }

        /**
         * Is the browser from a mobile device?
         *
         * @return boolean True if the browser is from a mobile device otherwise false
         */
        public function isMobile()
        {
            return $this->_is_mobile;
        }

        /**
         * Is the browser from a tablet device?
         *
         * @return boolean True if the browser is from a tablet device otherwise false
         */
        public function isTablet()
        {
            return $this->_is_tablet;
        }

        /**
         * Is the browser from a robot (ex Slurp,GoogleBot)?
         *
         * @return boolean True if the browser is from a robot otherwise false
         */
        public function isRobot()
        {
            return $this->_is_robot;
        }

        /**
         * Is the browser from facebook?
         *
         * @return boolean True if the browser is from facebook otherwise false
         */
        public function isFacebook()
        {
            return $this->_is_facebook;
        }

        /**
         * Set the browser to be from AOL
         *
         * @param $isAol
         */
        public function setAol($isAol)
        {
            $this->_is_aol = $isAol;
        }

        /**
         * Set the Browser to be mobile
         *
         * @param boolean $value is the browser a mobile browser or not
         */
        protected function setMobile($value = TRUE)
        {
            $this->_is_mobile = $value;
        }

        /**
         * Set the Browser to be tablet
         *
         * @param boolean $value is the browser a tablet browser or not
         */
        protected function setTablet($value = TRUE)
        {
            $this->_is_tablet = $value;
        }

        /**
         * Set the Browser to be a robot
         *
         * @param boolean $value is the browser a robot or not
         */
        protected function setRobot($value = TRUE)
        {
            $this->_is_robot = $value;
        }

        /**
         * Set the Browser to be a Facebook request
         *
         * @param boolean $value is the browser a robot or not
         */
        protected function setFacebook($value = TRUE)
        {
            $this->_is_facebook = $value;
        }

        /**
         * Get the user agent value in use to determine the browser
         *
         * @return string The user agent from the HTTP header
         */
        public function getUserAgent()
        {
            return $this->_agent;
        }

        /**
         * Set the user agent value (the construction will use the HTTP header value - this will overwrite it)
         *
         * @param string $agent_string The value for the User Agent
         */
        public function setUserAgent($agent_string)
        {
            $this->reset();
            $this->_agent = $agent_string;
            $this->determine();
        }

        /**
         * Used to determine if the browser is actually "chromeframe"
         *
         * @since 1.7
         * @return boolean True if the browser is using chromeframe
         */
        public function isChromeFrame()
        {
            return (strpos($this->_agent, "chromeframe") !== FALSE);
        }

        /**
         * Returns a formatted string with a summary of the details of the browser.
         *
         * @return string formatted string with a summary of the browser
         */
        public function __toString()
        {
            return "<strong>Browser Name:</strong> {$this->getBrowser()}<br/>\n" .
                "<strong>Browser Version:</strong> {$this->getVersion()}<br/>\n" .
                "<strong>Browser User Agent String:</strong> {$this->getUserAgent()}<br/>\n" .
                "<strong>Platform:</strong> {$this->getPlatform()}<br/>";
        }

        /**
         * Protected routine to calculate and determine what the browser is in use (including platform)
         */
        protected function determine()
        {
            $this->checkPlatform();
            $this->checkBrowsers();
            $this->checkForAol();
        }

        /**
         * Protected routine to determine the browser type
         *
         * @return boolean True if the browser was detected otherwise false
         */
        protected function checkBrowsers()
        {
            return (
                // well-known, well-used
                // Special Notes:
                // (1) Opera must be checked before FireFox due to the odd
                //     user agents used in some older versions of Opera
                // (2) WebTV is strapped onto Internet Explorer so we must
                //     check for WebTV before IE
                // (3) (deprecated) Galeon is based on Firefox and needs to be
                //     tested before Firefox is tested
                // (4) OmniWeb is based on Safari so OmniWeb check must occur
                //     before Safari
                // (5) Netscape 9+ is based on Firefox so Netscape checks
                //     before FireFox are necessary
                $this->checkBrowserWebTv() ||
                    $this->checkBrowserInternetExplorer() ||
                    $this->checkBrowserOpera() ||
                    $this->checkBrowserGaleon() ||
                    $this->checkBrowserNetscapeNavigator9Plus() ||
                    $this->checkBrowserFirefox() ||
                    $this->checkBrowserChrome() ||
                    $this->checkBrowserOmniWeb() ||

                    // common mobile
                    $this->checkBrowserAndroid() ||
                    $this->checkBrowseriPad() ||
                    $this->checkBrowseriPod() ||
                    $this->checkBrowseriPhone() ||
                    $this->checkBrowserBlackBerry() ||
                    $this->checkBrowserNokia() ||

                    // common bots
                    $this->checkBrowserGoogleBot() ||
                    $this->checkBrowserMSNBot() ||
                    $this->checkBrowserSlurp() ||

                    // check for facebook external hit when loading URL
                    $this->checkFacebookExternalHit() ||

                    // WebKit base check (post mobile and others)
                    $this->checkBrowserSafari() ||

                    // everyone else
                    $this->checkBrowserNetPositive() ||
                    $this->checkBrowserFirebird() ||
                    $this->checkBrowserKonqueror() ||
                    $this->checkBrowserIcab() ||
                    $this->checkBrowserPhoenix() ||
                    $this->checkBrowserAmaya() ||
                    $this->checkBrowserLynx() ||
                    $this->checkBrowserShiretoko() ||
                    $this->checkBrowserIceCat() ||
                    $this->checkBrowserIceweasel() ||
                    $this->checkBrowserW3CValidator() ||
                    $this->checkBrowserMozilla() /* Mozilla is such an open standard that you must check it last */
            );
        }

        /**
         * Determine if the user is using a BlackBerry (last updated 1.7)
         *
         * @return boolean True if the browser is the BlackBerry browser otherwise false
         */
        protected function checkBrowserBlackBerry()
        {
            if (stripos($this->_agent, 'blackberry') !== FALSE) {
                $aresult  = explode("/", stristr($this->_agent, "BlackBerry"));
                $aversion = explode(' ', $aresult[1]);
                $this->setVersion($aversion[0]);
                $this->_browser_name = self::BROWSER_BLACKBERRY;
                $this->setMobile(TRUE);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the user is using an AOL User Agent (last updated 1.7)
         *
         * @return boolean True if the browser is from AOL otherwise false
         */
        protected function checkForAol()
        {
            $this->setAol(FALSE);
            $this->setAolVersion(self::VERSION_UNKNOWN);

            if (stripos($this->_agent, 'aol') !== FALSE) {
                $aversion = explode(' ', stristr($this->_agent, 'AOL'));
                $this->setAol(TRUE);
                $this->setAolVersion(preg_replace('/[^0-9\.a-z]/i', '', $aversion[1]));

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is the GoogleBot or not (last updated 1.7)
         *
         * @return boolean True if the browser is the GoogletBot otherwise false
         */
        protected function checkBrowserGoogleBot()
        {
            if (stripos($this->_agent, 'googlebot') !== FALSE) {
                $aresult  = explode('/', stristr($this->_agent, 'googlebot'));
                $aversion = explode(' ', $aresult[1]);
                $this->setVersion(str_replace(';', '', $aversion[0]));
                $this->_browser_name = self::BROWSER_GOOGLEBOT;
                $this->setRobot(TRUE);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is the MSNBot or not (last updated 1.9)
         *
         * @return boolean True if the browser is the MSNBot otherwise false
         */
        protected function checkBrowserMSNBot()
        {
            if (stripos($this->_agent, "msnbot") !== FALSE) {
                $aresult  = explode("/", stristr($this->_agent, "msnbot"));
                $aversion = explode(" ", $aresult[1]);
                $this->setVersion(str_replace(";", "", $aversion[0]));
                $this->_browser_name = self::BROWSER_MSNBOT;
                $this->setRobot(TRUE);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is the W3C Validator or not (last updated 1.7)
         *
         * @return boolean True if the browser is the W3C Validator otherwise false
         */
        protected function checkBrowserW3CValidator()
        {
            if (stripos($this->_agent, 'W3C-checklink') !== FALSE) {
                $aresult  = explode('/', stristr($this->_agent, 'W3C-checklink'));
                $aversion = explode(' ', $aresult[1]);
                $this->setVersion($aversion[0]);
                $this->_browser_name = self::BROWSER_W3CVALIDATOR;

                return TRUE;
            } else if (stripos($this->_agent, 'W3C_Validator') !== FALSE) {
                // Some of the Validator versions do not delineate w/ a slash - add it back in
                $ua       = str_replace("W3C_Validator ", "W3C_Validator/", $this->_agent);
                $aresult  = explode('/', stristr($ua, 'W3C_Validator'));
                $aversion = explode(' ', $aresult[1]);
                $this->setVersion($aversion[0]);
                $this->_browser_name = self::BROWSER_W3CVALIDATOR;

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is the Yahoo! Slurp Robot or not (last updated 1.7)
         *
         * @return boolean True if the browser is the Yahoo! Slurp Robot otherwise false
         */
        protected function checkBrowserSlurp()
        {
            if (stripos($this->_agent, 'slurp') !== FALSE) {
                $aresult  = explode('/', stristr($this->_agent, 'Slurp'));
                $aversion = explode(' ', $aresult[1]);
                $this->setVersion($aversion[0]);
                $this->_browser_name = self::BROWSER_SLURP;
                $this->setRobot(TRUE);
                $this->setMobile(FALSE);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is Internet Explorer or not (last updated 1.7)
         *
         * @return boolean True if the browser is Internet Explorer otherwise false
         */
        protected function checkBrowserInternetExplorer()
        {

            // Test for v1 - v1.5 IE
            if (stripos($this->_agent, 'microsoft internet explorer') !== FALSE) {
                $this->setBrowser(self::BROWSER_IE);
                $this->setVersion('1.0');
                $aresult = stristr($this->_agent, '/');
                if (preg_match('/308|425|426|474|0b1/i', $aresult)) {
                    $this->setVersion('1.5');
                }

                return TRUE;
            } // Test for versions > 1.5
            else if (stripos($this->_agent, 'msie') !== FALSE && stripos($this->_agent, 'opera') === FALSE) {
                // See if the browser is the odd MSN Explorer
                if (stripos($this->_agent, 'msnb') !== FALSE) {
                    $aresult = explode(' ', stristr(str_replace(';', '; ', $this->_agent), 'MSN'));
                    $this->setBrowser(self::BROWSER_MSN);
                    $this->setVersion(str_replace(array('(', ')', ';'), '', $aresult[1]));

                    return TRUE;
                }
                $aresult = explode(' ', stristr(str_replace(';', '; ', $this->_agent), 'msie'));
                $this->setBrowser(self::BROWSER_IE);
                $this->setVersion(str_replace(array('(', ')', ';'), '', $aresult[1]));

                return TRUE;
            } // Test for Pocket IE
            else if (stripos($this->_agent, 'mspie') !== FALSE || stripos($this->_agent, 'pocket') !== FALSE) {
                $aresult = explode(' ', stristr($this->_agent, 'mspie'));
                $this->setPlatform(self::PLATFORM_WINDOWS_CE);
                $this->setBrowser(self::BROWSER_POCKET_IE);
                $this->setMobile(TRUE);

                if (stripos($this->_agent, 'mspie') !== FALSE) {
                    $this->setVersion($aresult[1]);
                } else {
                    $aversion = explode('/', $this->_agent);
                    $this->setVersion($aversion[1]);
                }

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is Opera or not (last updated 1.7)
         *
         * @return boolean True if the browser is Opera otherwise false
         */
        protected function checkBrowserOpera()
        {
            if (stripos($this->_agent, 'opera mini') !== FALSE) {
                $resultant = stristr($this->_agent, 'opera mini');
                if (preg_match('/\//', $resultant)) {
                    $aresult  = explode('/', $resultant);
                    $aversion = explode(' ', $aresult[1]);
                    $this->setVersion($aversion[0]);
                } else {
                    $aversion = explode(' ', stristr($resultant, 'opera mini'));
                    $this->setVersion($aversion[1]);
                }
                $this->_browser_name = self::BROWSER_OPERA_MINI;
                $this->setMobile(TRUE);

                return TRUE;
            } else if (stripos($this->_agent, 'opera') !== FALSE) {
                $resultant = stristr($this->_agent, 'opera');
                if (preg_match('/Version\/(1*.*)$/', $resultant, $matches)) {
                    $this->setVersion($matches[1]);
                } else if (preg_match('/\//', $resultant)) {
                    $aresult  = explode('/', str_replace("(", " ", $resultant));
                    $aversion = explode(' ', $aresult[1]);
                    $this->setVersion($aversion[0]);
                } else {
                    $aversion = explode(' ', stristr($resultant, 'opera'));
                    $this->setVersion(isset($aversion[1]) ? $aversion[1] : "");
                }
                if (stripos($this->_agent, 'Opera Mobi') !== FALSE) {
                    $this->setMobile(TRUE);
                }
                $this->_browser_name = self::BROWSER_OPERA;

                return TRUE;
            } else if (stripos($this->_agent, 'OPR') !== FALSE) {
                $resultant = stristr($this->_agent, 'OPR');
                if (preg_match('/\//', $resultant)) {
                    $aresult  = explode('/', str_replace("(", " ", $resultant));
                    $aversion = explode(' ', $aresult[1]);
                    $this->setVersion($aversion[0]);
                }
                if (stripos($this->_agent, 'Mobile') !== FALSE) {
                    $this->setMobile(TRUE);
                }
                $this->_browser_name = self::BROWSER_OPERA;

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is Chrome or not (last updated 1.7)
         *
         * @return boolean True if the browser is Chrome otherwise false
         */
        protected function checkBrowserChrome()
        {
            if (stripos($this->_agent, 'Chrome') !== FALSE) {
                $aresult  = explode('/', stristr($this->_agent, 'Chrome'));
                $aversion = explode(' ', $aresult[1]);
                $this->setVersion($aversion[0]);
                $this->setBrowser(self::BROWSER_CHROME);
                //Chrome on Android
                if (stripos($this->_agent, 'Android') !== FALSE) {
                    $this->setMobile(TRUE);
                }

                return TRUE;
            }

            return FALSE;
        }


        /**
         * Determine if the browser is WebTv or not (last updated 1.7)
         *
         * @return boolean True if the browser is WebTv otherwise false
         */
        protected function checkBrowserWebTv()
        {
            if (stripos($this->_agent, 'webtv') !== FALSE) {
                $aresult  = explode('/', stristr($this->_agent, 'webtv'));
                $aversion = explode(' ', $aresult[1]);
                $this->setVersion($aversion[0]);
                $this->setBrowser(self::BROWSER_WEBTV);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is NetPositive or not (last updated 1.7)
         *
         * @return boolean True if the browser is NetPositive otherwise false
         */
        protected function checkBrowserNetPositive()
        {
            if (stripos($this->_agent, 'NetPositive') !== FALSE) {
                $aresult  = explode('/', stristr($this->_agent, 'NetPositive'));
                $aversion = explode(' ', $aresult[1]);
                $this->setVersion(str_replace(array('(', ')', ';'), '', $aversion[0]));
                $this->setBrowser(self::BROWSER_NETPOSITIVE);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is Galeon or not (last updated 1.7)
         *
         * @return boolean True if the browser is Galeon otherwise false
         */
        protected function checkBrowserGaleon()
        {
            if (stripos($this->_agent, 'galeon') !== FALSE) {
                $aresult  = explode(' ', stristr($this->_agent, 'galeon'));
                $aversion = explode('/', $aresult[0]);
                $this->setVersion($aversion[1]);
                $this->setBrowser(self::BROWSER_GALEON);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is Konqueror or not (last updated 1.7)
         *
         * @return boolean True if the browser is Konqueror otherwise false
         */
        protected function checkBrowserKonqueror()
        {
            if (stripos($this->_agent, 'Konqueror') !== FALSE) {
                $aresult  = explode(' ', stristr($this->_agent, 'Konqueror'));
                $aversion = explode('/', $aresult[0]);
                $this->setVersion($aversion[1]);
                $this->setBrowser(self::BROWSER_KONQUEROR);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is iCab or not (last updated 1.7)
         *
         * @return boolean True if the browser is iCab otherwise false
         */
        protected function checkBrowserIcab()
        {
            if (stripos($this->_agent, 'icab') !== FALSE) {
                $aversion = explode(' ', stristr(str_replace('/', ' ', $this->_agent), 'icab'));
                $this->setVersion($aversion[1]);
                $this->setBrowser(self::BROWSER_ICAB);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is OmniWeb or not (last updated 1.7)
         *
         * @return boolean True if the browser is OmniWeb otherwise false
         */
        protected function checkBrowserOmniWeb()
        {
            if (stripos($this->_agent, 'omniweb') !== FALSE) {
                $aresult  = explode('/', stristr($this->_agent, 'omniweb'));
                $aversion = explode(' ', isset($aresult[1]) ? $aresult[1] : "");
                $this->setVersion($aversion[0]);
                $this->setBrowser(self::BROWSER_OMNIWEB);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is Phoenix or not (last updated 1.7)
         *
         * @return boolean True if the browser is Phoenix otherwise false
         */
        protected function checkBrowserPhoenix()
        {
            if (stripos($this->_agent, 'Phoenix') !== FALSE) {
                $aversion = explode('/', stristr($this->_agent, 'Phoenix'));
                $this->setVersion($aversion[1]);
                $this->setBrowser(self::BROWSER_PHOENIX);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is Firebird or not (last updated 1.7)
         *
         * @return boolean True if the browser is Firebird otherwise false
         */
        protected function checkBrowserFirebird()
        {
            if (stripos($this->_agent, 'Firebird') !== FALSE) {
                $aversion = explode('/', stristr($this->_agent, 'Firebird'));
                $this->setVersion($aversion[1]);
                $this->setBrowser(self::BROWSER_FIREBIRD);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is Netscape Navigator 9+ or not (last updated 1.7)
         * NOTE: (http://browser.netscape.com/ - Official support ended on March 1st, 2008)
         *
         * @return boolean True if the browser is Netscape Navigator 9+ otherwise false
         */
        protected function checkBrowserNetscapeNavigator9Plus()
        {
            if (stripos($this->_agent, 'Firefox') !== FALSE && preg_match('/Navigator\/([^ ]*)/i', $this->_agent, $matches)) {
                $this->setVersion($matches[1]);
                $this->setBrowser(self::BROWSER_NETSCAPE_NAVIGATOR);

                return TRUE;
            } else if (stripos($this->_agent, 'Firefox') === FALSE && preg_match('/Netscape6?\/([^ ]*)/i', $this->_agent, $matches)) {
                $this->setVersion($matches[1]);
                $this->setBrowser(self::BROWSER_NETSCAPE_NAVIGATOR);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is Shiretoko or not (https://wiki.mozilla.org/Projects/shiretoko) (last updated 1.7)
         *
         * @return boolean True if the browser is Shiretoko otherwise false
         */
        protected function checkBrowserShiretoko()
        {
            if (stripos($this->_agent, 'Mozilla') !== FALSE && preg_match('/Shiretoko\/([^ ]*)/i', $this->_agent, $matches)) {
                $this->setVersion($matches[1]);
                $this->setBrowser(self::BROWSER_SHIRETOKO);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is Ice Cat or not (http://en.wikipedia.org/wiki/GNU_IceCat) (last updated 1.7)
         *
         * @return boolean True if the browser is Ice Cat otherwise false
         */
        protected function checkBrowserIceCat()
        {
            if (stripos($this->_agent, 'Mozilla') !== FALSE && preg_match('/IceCat\/([^ ]*)/i', $this->_agent, $matches)) {
                $this->setVersion($matches[1]);
                $this->setBrowser(self::BROWSER_ICECAT);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is Nokia or not (last updated 1.7)
         *
         * @return boolean True if the browser is Nokia otherwise false
         */
        protected function checkBrowserNokia()
        {
            if (preg_match("/Nokia([^\/]+)\/([^ SP]+)/i", $this->_agent, $matches)) {
                $this->setVersion($matches[2]);
                if (stripos($this->_agent, 'Series60') !== FALSE || strpos($this->_agent, 'S60') !== FALSE) {
                    $this->setBrowser(self::BROWSER_NOKIA_S60);
                } else {
                    $this->setBrowser(self::BROWSER_NOKIA);
                }
                $this->setMobile(TRUE);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is Firefox or not (last updated 1.7)
         *
         * @return boolean True if the browser is Firefox otherwise false
         */
        protected function checkBrowserFirefox()
        {
            if (stripos($this->_agent, 'safari') === FALSE) {
                if (preg_match("/Firefox[\/ \(]([^ ;\)]+)/i", $this->_agent, $matches)) {
                    $this->setVersion($matches[1]);
                    $this->setBrowser(self::BROWSER_FIREFOX);

                    return TRUE;
                } else if (preg_match("/Firefox$/i", $this->_agent, $matches)) {
                    $this->setVersion("");
                    $this->setBrowser(self::BROWSER_FIREFOX);

                    return TRUE;
                }
            }

            return FALSE;
        }

        /**
         * Determine if the browser is Firefox or not (last updated 1.7)
         *
         * @return boolean True if the browser is Firefox otherwise false
         */
        protected function checkBrowserIceweasel()
        {
            if (stripos($this->_agent, 'Iceweasel') !== FALSE) {
                $aresult  = explode('/', stristr($this->_agent, 'Iceweasel'));
                $aversion = explode(' ', $aresult[1]);
                $this->setVersion($aversion[0]);
                $this->setBrowser(self::BROWSER_ICEWEASEL);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is Mozilla or not (last updated 1.7)
         *
         * @return boolean True if the browser is Mozilla otherwise false
         */
        protected function checkBrowserMozilla()
        {
            if (stripos($this->_agent, 'mozilla') !== FALSE && preg_match('/rv:[0-9].[0-9][a-b]?/i', $this->_agent) && stripos($this->_agent, 'netscape') === FALSE) {
                $aversion = explode(' ', stristr($this->_agent, 'rv:'));
                preg_match('/rv:[0-9].[0-9][a-b]?/i', $this->_agent, $aversion);
                $this->setVersion(str_replace('rv:', '', $aversion[0]));
                $this->setBrowser(self::BROWSER_MOZILLA);

                return TRUE;
            } else if (stripos($this->_agent, 'mozilla') !== FALSE && preg_match('/rv:[0-9]\.[0-9]/i', $this->_agent) && stripos($this->_agent, 'netscape') === FALSE) {
                $aversion = explode('', stristr($this->_agent, 'rv:'));
                $this->setVersion(str_replace('rv:', '', $aversion[0]));
                $this->setBrowser(self::BROWSER_MOZILLA);

                return TRUE;
            } else if (stripos($this->_agent, 'mozilla') !== FALSE && preg_match('/mozilla\/([^ ]*)/i', $this->_agent, $matches) && stripos($this->_agent, 'netscape') === FALSE) {
                $this->setVersion($matches[1]);
                $this->setBrowser(self::BROWSER_MOZILLA);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is Lynx or not (last updated 1.7)
         *
         * @return boolean True if the browser is Lynx otherwise false
         */
        protected function checkBrowserLynx()
        {
            if (stripos($this->_agent, 'lynx') !== FALSE) {
                $aresult  = explode('/', stristr($this->_agent, 'Lynx'));
                $aversion = explode(' ', (isset($aresult[1]) ? $aresult[1] : ""));
                $this->setVersion($aversion[0]);
                $this->setBrowser(self::BROWSER_LYNX);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is Amaya or not (last updated 1.7)
         *
         * @return boolean True if the browser is Amaya otherwise false
         */
        protected function checkBrowserAmaya()
        {
            if (stripos($this->_agent, 'amaya') !== FALSE) {
                $aresult  = explode('/', stristr($this->_agent, 'Amaya'));
                $aversion = explode(' ', $aresult[1]);
                $this->setVersion($aversion[0]);
                $this->setBrowser(self::BROWSER_AMAYA);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is Safari or not (last updated 1.7)
         *
         * @return boolean True if the browser is Safari otherwise false
         */
        protected function checkBrowserSafari()
        {
            if (stripos($this->_agent, 'Safari') !== FALSE
                && stripos($this->_agent, 'iPhone') === FALSE
                && stripos($this->_agent, 'iPod') === FALSE
            ) {

                $aresult = explode('/', stristr($this->_agent, 'Version'));
                if (isset($aresult[1])) {
                    $aversion = explode(' ', $aresult[1]);
                    $this->setVersion($aversion[0]);
                } else {
                    $this->setVersion(self::VERSION_UNKNOWN);
                }
                $this->setBrowser(self::BROWSER_SAFARI);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Detect if URL is loaded from FacebookExternalHit
         *
         * @return boolean True if it detects FacebookExternalHit otherwise false
         */
        protected function checkFacebookExternalHit()
        {
            if (stristr($this->_agent, 'FacebookExternalHit')) {
                $this->setRobot(TRUE);
                $this->setFacebook(TRUE);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Detect if URL is being loaded from internal Facebook browser
         *
         * @return boolean True if it detects internal Facebook browser otherwise false
         */
        protected function checkForFacebookIos()
        {
            if (stristr($this->_agent, 'FBIOS')) {
                $this->setFacebook(TRUE);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Detect Version for the Safari browser on iOS devices
         *
         * @return boolean True if it detects the version correctly otherwise false
         */
        protected function getSafariVersionOnIos()
        {
            $aresult = explode('/', stristr($this->_agent, 'Version'));
            if (isset($aresult[1])) {
                $aversion = explode(' ', $aresult[1]);
                $this->setVersion($aversion[0]);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Detect Version for the Chrome browser on iOS devices
         *
         * @return boolean True if it detects the version correctly otherwise false
         */
        protected function getChromeVersionOnIos()
        {
            $aresult = explode('/', stristr($this->_agent, 'CriOS'));
            if (isset($aresult[1])) {
                $aversion = explode(' ', $aresult[1]);
                $this->setVersion($aversion[0]);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is iPhone or not (last updated 1.7)
         *
         * @return boolean True if the browser is iPhone otherwise false
         */
        protected function checkBrowseriPhone()
        {
            if (stripos($this->_agent, 'iPhone') !== FALSE) {
                $this->setVersion(self::VERSION_UNKNOWN);
                $this->getSafariVersionOnIos();
                $this->getChromeVersionOnIos();
                $this->checkForFacebookIos();
                $this->setMobile(TRUE);
                $this->setBrowser(self::BROWSER_IPHONE);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is iPad or not (last updated 1.7)
         *
         * @return boolean True if the browser is iPad otherwise false
         */
        protected function checkBrowseriPad()
        {
            if (stripos($this->_agent, 'iPad') !== FALSE) {
                $this->setVersion(self::VERSION_UNKNOWN);
                $this->getSafariVersionOnIos();
                $this->getChromeVersionOnIos();
                $this->checkForFacebookIos();
                $this->setTablet(TRUE);
                $this->setBrowser(self::BROWSER_IPAD);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is iPod or not (last updated 1.7)
         *
         * @return boolean True if the browser is iPod otherwise false
         */
        protected function checkBrowseriPod()
        {
            if (stripos($this->_agent, 'iPod') !== FALSE) {
                $this->setVersion(self::VERSION_UNKNOWN);
                $this->getSafariVersionOnIos();
                $this->getChromeVersionOnIos();
                $this->checkForFacebookIos();
                $this->setMobile(TRUE);
                $this->setBrowser(self::BROWSER_IPOD);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine if the browser is Android or not (last updated 1.7)
         *
         * @return boolean True if the browser is Android otherwise false
         */
        protected function checkBrowserAndroid()
        {
            if (stripos($this->_agent, 'Android') !== FALSE) {
                $aresult = explode(' ', stristr($this->_agent, 'Android'));
                if (isset($aresult[1])) {
                    $aversion = explode(' ', $aresult[1]);
                    $this->setVersion($aversion[0]);
                } else {
                    $this->setVersion(self::VERSION_UNKNOWN);
                }
                $this->setMobile(TRUE);
                $this->setBrowser(self::BROWSER_ANDROID);

                return TRUE;
            }

            return FALSE;
        }

        /**
         * Determine the user's platform (last updated 1.7)
         */
        protected function checkPlatform()
        {
            if (stripos($this->_agent, 'windows') !== FALSE) {
                $this->_platform = self::PLATFORM_WINDOWS;
            } else if (stripos($this->_agent, 'iPad') !== FALSE) {
                $this->_platform = self::PLATFORM_IPAD;
            } else if (stripos($this->_agent, 'iPod') !== FALSE) {
                $this->_platform = self::PLATFORM_IPOD;
            } else if (stripos($this->_agent, 'iPhone') !== FALSE) {
                $this->_platform = self::PLATFORM_IPHONE;
            } elseif (stripos($this->_agent, 'mac') !== FALSE) {
                $this->_platform = self::PLATFORM_APPLE;
            } elseif (stripos($this->_agent, 'android') !== FALSE) {
                $this->_platform = self::PLATFORM_ANDROID;
            } elseif (stripos($this->_agent, 'linux') !== FALSE) {
                $this->_platform = self::PLATFORM_LINUX;
            } else if (stripos($this->_agent, 'Nokia') !== FALSE) {
                $this->_platform = self::PLATFORM_NOKIA;
            } else if (stripos($this->_agent, 'BlackBerry') !== FALSE) {
                $this->_platform = self::PLATFORM_BLACKBERRY;
            } elseif (stripos($this->_agent, 'FreeBSD') !== FALSE) {
                $this->_platform = self::PLATFORM_FREEBSD;
            } elseif (stripos($this->_agent, 'OpenBSD') !== FALSE) {
                $this->_platform = self::PLATFORM_OPENBSD;
            } elseif (stripos($this->_agent, 'NetBSD') !== FALSE) {
                $this->_platform = self::PLATFORM_NETBSD;
            } elseif (stripos($this->_agent, 'OpenSolaris') !== FALSE) {
                $this->_platform = self::PLATFORM_OPENSOLARIS;
            } elseif (stripos($this->_agent, 'SunOS') !== FALSE) {
                $this->_platform = self::PLATFORM_SUNOS;
            } elseif (stripos($this->_agent, 'OS\/2') !== FALSE) {
                $this->_platform = self::PLATFORM_OS2;
            } elseif (stripos($this->_agent, 'BeOS') !== FALSE) {
                $this->_platform = self::PLATFORM_BEOS;
            } elseif (stripos($this->_agent, 'win') !== FALSE) {
                $this->_platform = self::PLATFORM_WINDOWS;
            }

        }

        /**
         *      Check if Browser is HTML5 compatible
         *
         *  (c) dsphinx
         *
         * @return bool
         *
         */

        public function HTML5()
        {


            $html5_enable = FALSE;
            $version      = $this->getVersion();

            switch ($this->getBrowser()) {
                case self::BROWSER_MOZILLA:         // IE 11 Mozilla Windows ?
                    if ($version >= 3) {
                        $html5_enable = TRUE;
                    }
                    break;
                case self::BROWSER_IE:
                    if ($version >= 9) {
                        $html5_enable = TRUE;
                    }
                    break;
                case self::BROWSER_CHROME:
                    if ($version >= 16) {
                        $html5_enable = TRUE;
                    }
                    break;
                case self::BROWSER_FIREFOX:
                    if ($version >= 3.6) {
                        $html5_enable = TRUE;
                    }
                    break;
                case self::BROWSER_SAFARI:
                    if ($version >= 4) {
                        $html5_enable = TRUE;
                    }
                    break;
                case self::BROWSER_OPERA:
                    if ($version >= 10) {
                        $html5_enable = TRUE;
                    }
                    break;
                case self::BROWSER_IPAD:
                    if ($version >= 4) {                // Not sure ios ?
                        $html5_enable = TRUE;
                    }
                    break;
                case self::BROWSER_IPHONE:
                    if ($version >= 4) {
                        $html5_enable = TRUE;
                    }
                    break;


                default:
                    break;
            }


            return $html5_enable;
        }


    }

?>